not documented in manual $config key storeresponse. Default value is true. It allows for retrieval of Zend_Http_Reponse after calling request by getLastResponse. If set to falsegetLastReponse will return null instead.

The manual states "When set to false, some validation functions will be skipped." about strict$config key. The problem is what some means. It should mention that when true it performs validation against header names to see if they contain forbidden characters.

non BC changes to consider:
setAdapter doesnt have return statement, it could return $this to aid fluent interface like other set methods do